Copper speciation in soft, acid, humic waters: Effects on copper bioaccumulation by and toxicity to simocephalus serrulatus (Daphnidae)

Giesy, John P.; Newell, Avis D.; Leversee, Gordon J.

doi:10.1016/s0048-9697(83)80005-9

Cited by 48 publications

(31 citation statements)

References 30 publications

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“…These results substantiate some previous reports that complexes of copper with natural organic compound appear to contribute to toxicity [29][30][31][32]. Reports of metal complexes being essentially nontoxic have often involved strong synthetic chelators.…”

Section: Effects Of Dissolved Organic Matter On 96-h Lc50ssupporting

confidence: 90%

“…However, it is erroneous to conclude from such results that only cupric ion is toxic because copper complexes with ligands other than the added organic substance can remain constant relative to cupric ion and effects are thus not separable. Furthermore, some investigators have found toxicity on the basis of cupric ion activity to increase upon the addition of organic complexing agents [29][30][31][32]. Certain hydrophobic organo-copper species also have been demonstrated to be bioavailable and toxic [34,35].…”

Section: Organic Matter and Suspended Solidsmentioning

confidence: 99%

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The effects of water chemistry on the toxicity of copper to fathead minnows

Erickson

Benoit

Mattson

et al. 1996

Enviro Toxic and Chemistry

336

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Abstract-The effects of various water chemistry parameters on the toxicity of copper to larval fathead minnows were investigated. Increased pH, hardness, sodium, dissolved organic matter, and suspended solids each caused toxicity to decrease on the basis of total copper concentrations. In contrast, added potassium resulted in increased toxicity. Alkalinity had no observed effect on total copper LC50s, but its effects might have been masked by those of the cations added with it. In most cases, the effects of water chemistry were found to be similar for different endpoints (growth, survival at different durations), but there were differences in the relative magnitude of some effects across these endpoints. Over all experimental treatments, 96-h total copper LC50s varied 60-fold. Every water chemistry parameter also caused toxicity to vary significantly when expressed on the basis of cupric ion selective electrode measurements, sometimes more so than on the basis of total copper. Therefore, this study does not support attributing to cupric ion a singular importance in regulating toxicity to this test organism. A variety of copper species might be contributing to toxicity and it is evident that toxicity is also affected by water chemistry in ways not related to copper speciation.

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Section: Effects Of Dissolved Organic Matter On 96-h Lc50ssupporting

confidence: 90%

Section: Organic Matter and Suspended Solidsmentioning

confidence: 99%

The effects of water chemistry on the toxicity of copper to fathead minnows

Erickson

Benoit

Mattson

et al. 1996

Enviro Toxic and Chemistry

336

View full text Add to dashboard Cite

show abstract

“…A reduction of metal toxicity to Daphnid species in the presence of humic materials have been demonstrated by Giesy et al (1983) to Simocephalus serrulatus; Winner (1985) to Daphnia pulex; Oikari et al (1992) to Daphnia magna in waters with 14-20 mg l -1 humic substances; Kim et al (1999) to Ceriodaphnia dubia (2.5-10 mg l -1 DOC) and Ma et al (1999) to C. dubia at 5-20 mg l -1 humic acids. Thus, research on copper speciation, its toxicity and relation with natural DOM are necessary in order to define adequate monitoring parameters, as well as to understand the ecological dynamics of trace metals in environments of different trophic status.…”

Section: Introductionmentioning

confidence: 99%

The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

2008

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A major question in the field of ecotoxicology is how DOM affects copper accumulation and toxicity in planktonic organisms; copper acute toxicity and bioaccumulation in Ceriodaphnia silvestrii were investigated in the presence and absence of humic substances (HS) under controlled laboratory conditions. Copper was determined as free Cu2+ ions in the media and total copper in the animals; metal ion buffers were used for ion selective electrode calibration, extending the lower detection limit to 10(-11) mol l(-1). Groups of 20 adult females of similar sizes were exposed (24 h) to a range of nominal copper concentrations. Based on total added copper, LC50 was 4.4 x 10(-8) mol l(-1) without HS, whereas with 20 mg l(-1) HS, it was 25 times higher (1.1 x 10(-6) mol l(-1)). Based on free Cu2+ ions LC50 was statistically similar either with (2.8 x 10(-8) mol l(-1)) or without HS (3.3 x 10(-8 )mol l(-1)). The present results showed that natural DOM reduced copper toxicity and that free Cu2+ ions correlates to the bioavailable fraction to zooplankton. Nevertheless, copper bioaccumulation by C. silvestrii was similar either in the presence or absence of humic substances, suggesting that C. silvestrii regulates its body copper content up to 3.0 x 10(-8) mol l(-1) free Cu2+ ions in the media. The organisms were not able to deal with higher free Cu2+ ions concentrations in the media.

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“…Additions of DOC have also been shown to reduce Cu toxicity in a number of aquatic species. In cladocerans, Giesy et al [20] reported that the presence of organic matter reduced the accumulation of Cu in Simocephalus serrulatus, and De Schamphelaere and Janssen [21], as well as De Schamphelaere et al [22] demonstrated the protective effect of natural DOC additions on the copper toxicity in Daphnia magna. Similarly, in fish (rainbow trout [24]; fathead minnow [18]) acute Cu toxicity has been shown to decrease when the concentration of DOC in the exposure water was increased.…”

Section: Effect Of Added Doc On Copper Toxicitymentioning

confidence: 99%

The effect of natural dissolved organic carbon on the acute toxicity of copper to larval freshwater mussels (glochidia)

Gillis

McGeer

Mackie

et al. 2010

Enviro Toxic and Chemistry

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The present study examined the effect of dissolved organic carbon (DOC), both added and inherent, on Cu toxicity in glochidia, the larvae of freshwater mussels. Using incremental additions of natural DOC concentrate and reconstituted water, a series of acute copper toxicity tests were conducted. An increase in DOC from 0.7 to 4.4 mg C/L resulted in a fourfold increase (36 150 mg Cu/L) in the 24 h median effective concentration (EC50) and a significant linear relationship (r 2 0.98, p 0.0008) between the DOC concentration and the Cu EC50 of Lampsilis siliquoidea glochidia. The ameliorating effect of added DOC on Cu toxicity was confirmed using a second mussel species, the endangered (in Canada) Lampsilis fasciola. The effect of inherent (i.e., not added) DOC on Cu toxicity was also assessed in eight natural waters (DOC 5 15 mg C/L). These experiments revealed a significant relationship between the EC50 and the concentration of inherent DOC (r 2 0.79, p 0.0031) with EC50s ranging from 27 to 111 mg Cu/L. These laboratory tests have demonstrated that DOC provides glochidia with significant protection from acute Cu toxicity. The potential risk that Cu poses to mussel populations was assessed by comparing Cu and DOC concentrations from significant mussel habitats in Ontario to the EC50s. Although overall mean Cu concentration in the mussel's habitat was well below the acutely toxic level given the concentration of DOC, episodic Cu releases in low DOC waters may be a concern for the recovery of endangered freshwater mussels. The results are examined in the context of current Cu water quality regulations including the U.S. Environmental Protection Agency's (U.S. EPA) biotic ligand model.

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Copper speciation in soft, acid, humic waters: Effects on copper bioaccumulation by and toxicity to simocephalus serrulatus (Daphnidae)

Cited by 48 publications

References 30 publications

The effects of water chemistry on the toxicity of copper to fathead minnows

The effects of water chemistry on the toxicity of copper to fathead minnows

The effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

The effect of natural dissolved organic carbon on the acute toxicity of copper to larval freshwater mussels (glochidia)

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